Badge on PM tab for new message count; Check for new PMs on app launch and app enter foreground
Merge branch 'pm-badges' of git://github.com/hardstylle/Awful into hardstylle-pm-badges

Conflicts:
	Awful.xcodeproj/project.pbxproj
Cleanup and formatting.

We now removing KVO observers in AwfulTabBar, and we no longer create new badge
views on every tab bar re-layout.